So does the load on the Xfrm affect the B-H curve in any way, other than a temperature dependence type effect?

I presume inductors could be hooked across the same output terminals?

V, H, G are vertical, horizontal and ground, right?

So the isolation xfrm would be on the input side?

__________________
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Thank you for the valuable information.
I intend to build a more involving unit for to be able to view a “calibrated” curve.
The 50R has to be scaled in value and wattage for different primary currents (magnetization Current Im) and Vprim and the integrator components have to be scaled for different Vprim and different frequencies (so the unit can be used for audio x-formers as well).
When I will build it (or sketch it on paper) I will post here for comments.

Ron E

Rod Elliot here insists that “For any power transformer, the maximum flux density is obtained when the transformer is idle”
I think that he is correct.
When this circuit is built in a proper way, it will show it.

Yes. The H, G, V in the diagram correspond to the points where the Horizontal (H), Ground (G), Vertical (V) inputs of the Oscilloscope will be connected.

Yes. The secondary (output) of the isolation x-former will be connected to the primary (input) of the device under test (DUT)